參數(shù)資料
型號： MPM21CUB450A
廠商： INTEL CORP
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 450 MHz, MICROPROCESSOR, XMA
封裝： MMC-2
文件頁數(shù)： 19/64頁
文件大?。?/td> 826K
代理商： MPM21CUB450A
Celeron
Processor Mobile Module MMC-2
at 700 MHz, 650 MHz, 600 MHz, 550 MHz, 500 MHz, and 450 MHz
20
Datasheet
243357-005
Extended Data Out (EDO) DRAM
66-MHz memory bus
The mobile module’s clocking architecture supports the use of SDRAM. The clocking mode for
100-MHz SDRAM memory configurations allows all host and SDRAM clocks to be generated
from the same clocking source on the system electronics. For complete details about memory
device support, organization, size, and addressing when using SDRAM memory and trace length
guidelines, refer to the Intel Pentium III Processor Mobile Module System Electronics 100-MHz
Layout Guidelines Revision. 1.0 (OR-1780).
4.3.2
Reset Strap Options
Several strap options on the memory address bus define the behavior of the mobile module after
reset. Other straps are allowed to override the default settings. Table 13 shows the various straps
and their implementation.
4.3.3
PCI Interface
The PCI interface of the 82443BX Host Bridge is available at the MMC-2 connector. The
82443BX Host Bridge supports the PCI Clockrun protocol for PCI bus power management. In this
protocol, PCI devices assert the CLKRUN# open-drain signal when they require the use of the PCI
interface. Refer to the PCI Mobile Design Guide for complete details on the PCI Clockrun
protocol.
The 82443BX Host Bridge is responsible for arbitrating the PCI bus. The 82443BX Host Bridge
can support up to five PCI bus masters. There are five PCI Request/Grant pairs, REQ[4:0]# and
GNT[4:0]#, available on the connector to the system electronics.
Note:
The PCI interface on the MMC-2 connector is 3.3V only. PCI devices that are 5.0V are not
supported.
The 82443BX Host Bridge system controller is compliant with the PCI 2.1 Specification, which
improves the worst case PCI bus access latency from earlier PCI specifications. The 82443BX
Host Bridge supports only Mechanism #1 for accessing PCI configuration space. This implies that
signals AD[31:11] are available for PCI IDSEL signals. However, since the 82443BX Host Bridge
Table 13. Configuration Straps for the 82443BX Host Bridge System Controller
Signal
Function
Module Default Setting
Optional Override on
System Electronics
MAB[12]#
Host Frequency Select
Strapped high on the module for 100
MHz
None
MAB[11]#
In Order Queue Depth
No strap, maximum queue depth is set
at 8
None
MAB[10]#
Quick Start Select
Strapped high on the module for Quick
Start mode
None
MAB[9]#
AGP Disable
No strap, AGP is enabled
Strap high to disable
AGP
MAB[7]#
MM Configuration
No strap, standard MMC-2 mode
None
MAB[6]#
Host Bus Buffer mode
select
Strapped high on the module for mobile
PSB buffers
None
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